Hemmi, JanZeil, Jochen2015-12-130022-0949http://hdl.handle.net/1885/86668When defending resources, animals need to reliably detect and identify potential competitors. Animals that live at high population densities would be expected to be efficient in this aspect of resource defence since the time lost in false alarms could beKeywords: animal; article; association; Australia; behavior; Brachyura; comparative study; competitive behavior; distance perception; physiology; statistical model; videorecording; Animals; Brachyura; Competitive Behavior; Cues; Distance Perception; Linear Models; Burrow defence; Competitor; Fiddler crab; Resource defence; Territory; Uca vomeris; Visual behaviour200310.1242/jeb.006322015-12-12